Two Strains of S

question 14

Multiple Choice

Two strains of S.cerevisae (yeast) are crossed.One has the genotype A B and the other a b.Which statement correctly describes the tetrads that can be produced by one reciprocal exchange without gene conversion in the dihybrid?

• A)Recombination occurs at the four-strand stage to produce a tetrad with A B, A B, a B, and a b chromosomes.
• B)Recombination occurs at the four-strand stage to produce a tetrad with A B, A b, a B, and a b chromosomes.
• C)Recombination occurs at the two-strand stage to produce a tetrad with A B, A b, a B, and a b chromosomes.
• D)Recombination occurs at the two-strand stage to produce a tetrad with A b, A b, a B, and a B chromosomes.

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